Automatic web transfer device



March 15, 1966 Z1MMERMAN 3,240,092

AUTOMATIC WEB TRANSFER DEVICE Filed Oct. 8, 1965 6 Sheets-Sheet l INVENTOR. GERALD H. ZIMMERMAN a; Lil

ATTORNEYS March 15, 1966 ZIMMERMAN 3,240,092

AUTOMATIC WEB TRANSFER DEVICE 6 Sheets-Sheet 2 Filed Oct. 8, 1963 INVENTOR. @EBALD H. ZSMMERMAN BY %M' I ATTORNEYS March 15, 1966 zlMMERMAN 3,240,092

AUTOMATIC WEB TRANS FER DEVICE llllllmm INVENTOR. GERALD H. 21 MME'ZRMAN A TORNEYS March 15, 1966 G. H. ZIMMERMAN 3,240,092

AUTOMATIC WEB TRANSFER DEVICE Filed Oct. 8, 1963 6 Sheets-Sheet 4.

INVENTOR. GERALD H. ZMMERMAN A TTORNE YS March 15, 1966 Z|MMERMAN 3,240,092

AUTOMATIC WEB TRANSFER DEVICE Filed Oct. 8, 1963 6 Sheets-Sheet 5 INVENTOR GERALD H. ZIMMERMAN March 15, 1966 G. H. ZIMMERMAN 3,240,092

AUTOMATIC WEB TRANSFER DEVICE Filed Oct. 8, 1963 6 Sheets-Sheet 6 NVENTO GERALD H N United States Patent 3,240,092 AUTQMATIC WEE TRANSFER DEVICE Gerald H. Zimmerman, Wilmington, DeL, assignor to Beloit Eastern Corporation, a corporation of Delaware Filed Oct. 8, 1963, Ser. No. 314,712 25 Claims. (CI. 83-52) The present invention relates to improvements in moving web cutting mechanisms and particularly to a device for cutting a tough or heavy web supported on a drum in a winder machine while the web is traveling.

The invention contemplates providing a shuttle or cart means having angled wheels thereon for riding against a guide bar extending across a winder drum to cut the web and having a cutter on the cart means, a plow means for moving beneath the web on the drum, first and second blades coacting to provide a snipping or shearing action for providing an initial cut and being carried across the drum for slitting the sheet the resmainder of the way after the initial cut, with a track for lifting the cart means ofi the drum and tilting to permit the cart means to move back to the starting position after the cut.

In a winding machine of the type shown in the copending patent application of Lawrence A. Moore et al., Serial No. 176,991, filed March 2, 1962, a web being wound on a roll travels over the surface of a winding drum and when the roll is filled the web is cut. Various cutting means are provided and often cutting air jets or manually operated snap lines are used. However in cutting very heavy paper web ordinary cutting devices are impractical and unsatisfactory. Failure to provide a smooth or complete cut often results in bunching up of the web and jamming of the machinery, or failure to transfer the cut end to the fresh core on which it is to be wound, resulting in hazards to personnel, damage to the machinery and costly shutdown periods with a loss of time and unnecessary expense.

An object of the present invention is to provide an improved web cutting mechanism which is capable of cutting heavier paper such as Kraft, board, synthetic nonwoven web material and other web materials which are difficult or impossible to cut with cutting methods and apparatus heretofore available.

A further object of the invention is to provide an improved automatic cutting mechanism to cut a moving web and automatically transfer the new end or the tail to a secondary spool for continuous operation.

A further object of the invention is to provide an improved cutting mechanism wherein the cutter is supported on a shuttle which has improved mechanism for automatically carrying it across a winding drum on which a web is carried, which also has improved mechanism for returning the shuttle to its starting point.

A still further object of the invention is to provide an improved mechanism and method for cutting heavy web or tough web material having a unique arrangement for starting the cut.

A further object of the invention is to provide an improved traveling web cutting mechanism using a knife or blade structure with improved design for moving along the surface of a drum beneath the traveling web to raise the web for the blade structure.

A still further object of the invention is to provide an improved web cutting mechanism which is completely automatic in operation and which is more economical in construction than devices heretofore used but which is completely reliable in operation.

Yet another object of the invention is to provide an improved automatic cutting mechanism which travels across the surface of a rotating web supporting drum and which is capable of operating at optimum speeds,

3,24%,092 Patented Mar. 15, 1966 being driven across the web by the rotating drum and being adjustable to vary the speed across the web to obtam optimum speed with difi'erent speeds of drum travel.

Other objects, advantages and features will become more apparent with the teachings of the principles of the present invention in connection with the disclosure of the preferred embodiment thereof in the specification, claims and drawings in which:

FIGURE 1 is an end elevational view of a web supporting drum and winder having a slitting mechanism constructed and operating in accordance with the principles of the present invention;

FIGURE 2 is a detailed top plan view of the shuttle or cart carrying the cutter for traveling across the web for the slitting operation;

FIGURE 3 is an end elevational view of the shuttle of FIGURE 2, taken from a direction with the shuttle moving toward the viewer;

FIGURE 4 is a fragmentary elevational View, with parts omitted, of the mechanism of FIGURE 1 taken generally in the direction indicated by the arrowed lines IV-IV of FIGURE 1;

FIGURE 5 is an end elevational view with parts removed, similar to FIGURE 1, and showing the parts in different operating positions;

FIGURE 6 is a sectional view taken substantially along line VI--VI of FIGURE 1 showing mechanism for starting the shuttle on its movement; and

FIGURE 7 is a side elevational view of the shuttle of FIGURE 2. i

As shown on the drawings:

FIGURE 1 shows a winder drum 10 which carries a traveling web W on the surface thereof. The web is wound onto a winding roll supported on rails or the like which is held in contact with the drum 10 during a portion of its winding operation and moved away along rails when it is substantially completed in the manner of the copending aforementioned Moore et a1. application. When a fresh roll is to be started, a fresh core C is rotated until its surface speed is substantially the same as the surface speed of the drum 10, and then is lowered down into contact with the drum as shown in FIGURE 1. At that time the traveling web W is cut and the lead end W is carried up onto the core C. This may be accomplished by air jets and the lead end W may be stuck to the core by being wetted by adhesive, and it will be apparent that a clean complete cut must be made across the traveling web. The cut is made at an angle thereto so that the tail W will travel upwardly smoothly onto the core C.

The drum 10 is supported on a journal 11 in a bearing 11a, and a bracket 12a supported on the bearing housing carries a starting bracket or platform 12 from which a shuttle or cart means 19, FIGURE 2 is started in its travel across the drum 10. The shuttle is omitted from FIGURE 1 for convenience of illustration, but is pushed out onto the drum 10 by push arm 13. The shuttle is guided across the drum by a guide bar 16 having an inclined guide surface 15, and then travels across the drum to cut a diagonal slit across the web.

When the shuttle reaches the other end of the drum it is lifted ofi the drum and returns along a track 18 to its starting point.

The shuttle 19 includes a frame plate 20 with arcuate slotted opening 21 therein in which are located wheels 22, FIGURE 2. The wheels are rotatably supported on brackets or journal arms 23. Other wheels are spaced so as to provide a stable support for the shuttle 19 and at least three wheels are provided, with four being shown in the preferred embodiment, spaced so as to provide the support for the shuttle as it travelsacross the drum surface. The wheels preferably have an outer frictional surface such as of rubber so that the relative rotation of the drum surface beneath them will carry the shuttle across the drum due to the angular positioning of the wheels 22.

The wheels are preferably at a 45 angle with respect to the axis of the drum, but the angle is adjustable. For example, for a slower traveling web with a slower moving drum surface, the angle of the wheel axis relative to the axis of the drum can be increased which will cause the shuttle 19 to run relatively faster across the drum surface to maintain optimum cutting speed. For a faster traveling drum surface, the angle of the wheels can be decreased to obtain the optimum shuttle speed. The wheel supporting brackets 23 are supported on the plate by a pivot bolt 24 and a clamping bolt 25 and the plate has slots 26 through which the clamping bolt 25 extends to permit adjustment of the wheel supporting brackets 23. The wheels are each maintained at the same angle, and the cutter 36 is also adjusted so that it will be parallel to the wheels in the manner which will later be described.

At the center of the shuttle plate 20 is an upright member 27 carrying an elongate rider or a follower 28, FIGURES 2 and 3. The follower 28 is preferably made of a slippery material such as a plastic known to the trade as Teflon which is polytetrafluoroethylene. The face of the rider 28 slides along the inclined cam surface 15, and for this purpose is rounded so as to maintain a smooth sliding engagement without critical machining of parts and with slight relative tilting between the parts. The Teflon bar 28 extends parallel to the shuttle 19 and supports it against the guide surface 15 to cause the shuttle to move with relative movement of the drum 10.

For return of the shuttle 19 when it is completed its run across the drum from the starting end to the finishing end of the cut, rollers 33 ride in the track 18. The track 18 is substantially U-shaped with flanges at the sides of the downwardly facing open side, and the rollers 33 have circular roller surfaces at each side to ride on the flanges.

The rollers 33 are supported on upright pivotal brackets 29 and 30 which are pivoted at their lower ends on the upright 27 on the shuttle plate 20. The brackets are interconnected by a tie bar pivotally connected at its ends to the brackets 29 and 30. At the upper ends of the brackets 29 and 30 are adjustable roller supports 31 and 32 which are pivotally mounted on the brackets to permit the rollers 33 to align themselves to the direction of the track 18. The roller supports 31 and 32 are adjustable so that the rollers 33 can be raised to a position where they are free floating in the track, as indicated by the space 33a, when the shuttle 19 moves across the drum. The shuttle can then rest on the drum with its own weight. However when the track 18 is lifted after the shuttle reaches the far end of the drum 10, the rollers 33 will support the shuttle.

The pusher mechanism for starting the shuttle or cart means 19 in its travel across the drum 10 is shown in FIGURE 6. It includes the pusher arm 13 which is secured to a piston rod 37 connected to a piston slidable in a cylinder 38. Suitable air pressure supply lines are connected to the cylinder 38 so that when the shuttle is to be started air is admitted to the cylinder to move the piston rod and cause the pusher arm 13 to push the vehicle out onto the surface of the drum 10. As soon as it leaves its platform 12 and the wheels engage the drum surface it will start traveling across the drum, and the cutter 36 will operate as will later be described.

The pusher arm 13 is guided or held, so that the piston rod 37 cannot rotate, by guide bars such as 39 which extend parallel to the piston rod 37 and ride in grooves such as 39a in the arm 13.

The guide bar 16 which extends across the machine,

and the track 18 which is supported thereon, are carried on an overhead arbor support which lifts the entire unit up at the end of a run of a shuttle 19 across the drum, permits the shuttle 19 to run back to the starting end of the drum, and sets it back down on the platform 12.

The overhead arbor assembly includes upper pivotally mounted arbor arms 40 and 40" which are supported on a pivotal shaft 43 extending along parallel above the drum 10. The shaft is pivotally supported in brackets 42 suitably mounted on bearing caps on the bearing housings. The arbor arm 40' at the rear end of the machine is longer than the arbor arm 40 for reasons which will become apparent with further description of the operation of the mechanism.

At the outer end of the arbor arms 40 and 40 are support arms 41 and 41' which are pivotally connected to the arbor arms, and are secured to the guide bar 16.

The combined arbor arm 40 and support arm 41 for the front end of the machine is of the same length as the combined arbor arm 40 and support arm 41' at the rear end of the machine when the arms are in the lower position fo FIGURE 1.

However when the arms are in their raised position, as shown in FIGURE 5, they act to tilt the track 18 downwardly from the rear to the front end of the machine. In other words the rear end of the track is held higher by the combined longer arbor arm 40' and the shorter support arm 41', than the front end of the track, which is supported by the shorter arbor arm 40 and longer support arm 41.

For raising the arms to the dotted line position of FIGURE 5, crank arms 44 are secured to the shaft 43, and are operated by piston rods 45 connected to pistons in operating cylinders 47. The cylinders are mounted on brackets 48, FIGURE 4 on the frame 4?. Suitable air pressure leads are connected to the cylinder 47 for operating piston rods 45.

The air supply of the mill or from a suitable supply is also connected to lines leading to the air jets 53 and 54, FIGURES 1 and 5. The air jet 54 is mounted on the bracket 12a and the overhead air jet 53 is mounted on the arbor arm 40. These jets coact to raise the tail W when the web is cut, and cause it to wrap itself around the core C to start the winding operation.

When the arms are in their lowered position of FIG- URE 1, the track 18 is parallel to the surface of the drum 10, and the guide bar 16 is also parallel to the surface. The shuttle in traveling across the drum surface from the starting end to the finishing end engages a stop at the far end of its travel provided by a butyl rubber bumper Sil held in a bracket 51. Butyl is preferred inasmuch as it has substantially no bounce, and resiliently stops the travel of the shuttle 19 without causing it to bounce back onto the drum. A bumper engaging surface 52 is provided on the shuttle. A platform 55 is provided off the drum for supporting the shuttle at the far end of its travel as it hits the bumper 50, and before it is lifted by the overhead arbor assembly.

When the arbor assembly is raised the rollers 33 will permit the arbor to floatingly roll down the track 18 by the action of gravity back to the starting end of its travel, whereupon the overhead arbor is lowered to lower the shuttle 19 onto the starting platform 12.

The cutter 36 incorporates a pivotal spring pressed plow 56 which rides along the surface of the drum to raise the web for cutting. The pl'ow has a lower riding surface 59 which engages the drum surface in the manner shown in FIGURE 3. The plow has an upwardly curved upper surface 61 and a lateral plow tip 69 which tapers rearwardly so as to present a front edge extending substantially across the web. As will be observed the web will be raised upwardly onto the upwardly curved surface 61 onto the edge of a lower knife 62 which is rigidly mounted on the cutter.

The plow is pivotally supported at 57 on the shuttle,

and the torsion spring 58 presses the plow downwardly against the drum surface.

An upper knife 63 is pivotally mounted on the cutter 36 at 74, FIGURE 2. It is held laterally against the lower knife by an angular tension spring 73 so that the inner flat surfaces of the lower and upper knives 62 and 63 remain in sliding contact for the most effective action between their sharpened facing edges. The knives are positioned so that they extend toward each other in a V at 64. The two knives therefore coact in a scissors or snipping action when the upper knife 63 is moved relative to the lower knife 62 or, in other words, when their sharpened edges are moved relatively toward each other.

The upper knife is moved by a knife operating arm 67, FIGURES 2, 3 and 7, pivoted at 68. The knife operating arm has an adjustable pushing pin 66 which engages a ledge 65 on the upper knife 63. The arm 67 is urged or operated by a coil compression spring 68a on an adjustable bolt 69. The head of the bolt 69 limits the forward or closing pivotal movement of the arm 67. In each of the FIGURES 2, 3 and 7 the arm 67 is shown in its closed position.

However when the shuttle 19 moves to its starting position, the arm 67 is cocked by the rear follower end 70 riding beneath a cam 71, FIGURES l, 4 and S, with the cam having a tapered leading edge 72, FIGURE 4, so that end 70 can easily ride beneath the cam. With the arm 67 cocked beneath the cam 71, the upper knife 63 is raised. The ledge 65 is held up against the lower end of the pin 66 by the spring 73.

When the shuttle 19 is pushed forwardly onto the drum, the end 70 rides out from underneath the cam 71 to release the knife 63 so that the coil spring 68a pushes it downwardly in the scissors or snipping action relative to the lower knife 62. This action is timed so that in accordance with the method of the present invention the scissors or snipping action occurs after the edgs of the web is pushed up into the V 64 to be slightly bunched therein. It has been discovered that this pushing or bunching action improves the initial cut formed by the snipping action between the knives and insures effective slitting of the web. The snipping action between the knives is of course followed by continuous movement of the knives and the web is slipped all the way across primarily by the action of the lower knife 62. The web is continually tensioned by the action of the plow pushing the web up on top of the knife and a rapid smooth continuous sure cutting action occurs.

The angle of the cutter 36 which is adjusted so that the edges of the knives 62 and 63 are parallel to the wheels 22 is adjusted by loosening and retightening of the bolts 75 and 76. The cutter is supported on a base plate 74 mounted on the plate 20 of the shuttle, and the front bolt 75 acts as a pivot, with a rear bolt 76 extending to a slot 77 in the plate 74.

In operation the arm 13, FIGURE 1, pushes the shuttle 19, FIGURE 2, off of the platform 12, FIGURE 1 onto the drum 10. The shuttle moves rapidly across the drum by the action of the friction wheels 22 against the drum surface, and the follower 28 slides along the guide surface 15. The plow 56 slides beneath the web and as the web is gathered into the V 64-, FIGURE 3, of the cutter the upper knife or blade 63 moves downwardly against the lower blade or knife 62 for an initial cut, and the knives continue to move on across the machine with the shuttle. At the rear end of the drum the overhead arbor assembly is raised to lift the shuttle 19 whereupon its supporting rollers 33 ride downwardly in the inclined track 18 back to the starting end.

Thus it will be seen that I have provided an improved web cutting mechanism which meets the objectives and features above set forth. The mechanism has been found to be uniquely effective in being able to cut very heavy paper webs or synthetic webs which cannot be cut by conventional mechanisms or methods. The mechanism 6 is rugged in construction and capable of operation with web surface speeds of a substantial range.

The mechanism is capable of completely automatic operation, has an ability to cut the web on the winding drum between the secondary spool and the wound roll, effects a reduction in material waste, and is of economical construction. The automatic initial snipping action and continued shearing of the web effects an improved cutting action, as does effective function of the shuttle in is travel across the drum.

The drawings and specification present a detailed disclosure of the preferred embodiments of the invention, and it is to be understood that the invention is not limited to the specific forms disclosed, but covers all modifications, changes and alternative constructions and methods falling within the scope of the principles taught by the invention.

I claim as my invention:

1. A web cutting mechanism for a traveling web comprising,

a web supporting rotating drum having a cylindrical outer surface,

a first blade having an upwardly facing cutting edge for moving across the drum beneath the web and cutting the web,

a coacting initial cut second blade coacting with said first blade for forming an initial cut, means moving said second blade downwardly against said web coacting with said first blade in a scissors action at the edge of the web for initiating said cut,

a cart means supporting said blades, and wheel means on said cart means angles with respect to the axis of said drum for carrying the cart means along the drum length for cutting the web.

2. A mechanism for cutting a Web carried on the surface of a rotating drum comprising,

a first blade having an upwardly facing cutting edge for moving across he drum beneath the web and cutting the web,

a coacting initial cut second blade coacting with said first blade for forming an initial cut, means moving said second blade downwardly against said web coacting with said first blade in a scissors action at the edge of the web for initiating said cut,

a cart means supporting said blades, and means carrying the cart means along the length of the drum for slitting the web.

3. A mechanism for acting on a traveling web having a surface moving with the web comprising,

a movable cart means,

web acting means on the cart means for moving in operative relationship to the web across its width,

and wheel means frictionally engageable with said surface positioned at an angle leading into the direction of web travel for transmitting a frictional force from said surface to said cart means so that said cart means is propelled across the width of the web.

4. A cutting mechanism for acting on a traveling web having a surface moving with the web comprising,

a movable cart means,

a slitting knife means carried on the cart means for forming an angular cut across the width of the Web, and wheel means frictionally engageable with said surface positioned at an angle leading into the direction of web travel for transmitting a frictional force on said surface to said cart means so that said cart means is propelled across the width of the web.

5. A cutting mechanism for acting on a traveling web carried on a supporting surface comprising,

a movable cart means,

a slitting knife means carried on the cart means forming an angular cut across the width of the web,

and at least three friction wheel means on said cart means spaced laterally and longitudinally with respect to the direction of web travel for stably supporting the cart means on said surface and positioned at an angle leading into the direction of web travel for transmitting a frictional force from said surface to said cart means so that said cart means is propelled across the width of the web. 6. A cutting mechanism for acting on a traveling web having a supporting surface moving with the web comprising,

a movable cart means, a slitting knife means carried on the cart means for forming an angular cut across the width of the web,

wheel means frictionally engageable with said surface positioned at an angle leading into the direction of web travel for transmitting a frictional force from said surface to said cart means so that said cart means is propelled across the width of the web,

and means for adjusting the angle of said wheel means relative to the direction of travel of said surface for controlling the speed of movement of the cart means across the web relative to the linear speed of web travel.

7. A cutting mechanism for acting on a traveling web having a surface moving with the web comprising,

a movable cart means, a slitting knife means carried on the cart means for forming an angular cut across the width of the web,

and a plurality of wheels on the cart means angled toward said surface travel having outer surfaces of frictional material for transmitting a frictional force from said surface to said knife means so that said knife means is propelled across the web.

8. A cutting mechanism for acting on a traveling web supported on the surface of a drum comprising,

a movable cart means,

a slitting knife means carried on the cart means having a cutting edge for forming an angular cut across the width of the web,

wheel means frictionally engageable with said surface for transmitting a frictional force from said surface to said cart means so that said cart means is propelled across said surface,

means for adjusting the angle of said wheel means relative to the cart means for controlling the speed of travel of the cart means across said surface,

and means for adjusting the angle of said knife means so that said cutting edge is substantially parallel to the direction of said wheel means.

9. A mechanism for cutting a traveling web comprising,

a knife member for traveling in a direction across the entire width of the traveling web and for cutting said traveling web into two separate pieces during the motion of said web so that an angular cut is made in said web as said web travels,

means for carrying said knife member laterally relative to the direction of web travel,

and means making an initial cut in the side edge of said web during the motion of said web providing a beginning path of travel for said knife member.

10. A mechanism for cutting a traveling web comprising,

a knife member for traveling in a direction across the entire width of the traveling web and for cutting said traveling web into two separate pieces during the motion of said web so that an angular cut is made in said web as said web travels,

means for carrying said knife member laterally relative to the direction of web travel,

and a scissors means making an initial cut in the side edge of said web during the motion of said web as the knife member enters the web providing a beginning path of travel for the knife member.

11. A mechanism for cutting a traveling web comprising,

a cutter including a first knife member and a second knife member for cutting the traveling web into 8 two separate pieces during the motion of said web so that an angular cut is made in said web as said web travels, said first and second knife members each having cutting edges,

means supporting said cutter for carrying the cutter laterally relative to the direction of web travel across the entire width of the web,

and means relatively moving said knife members closing said cutting edges in a scissors movement as said cutter enters the web edge during the motion of said web.

12. A mechanism for cutting a traveling web comprising,

a cutter including a first knife member and a second knife member for cutting the traveling web into two separate pieces, said first and second knife members each having cutting edges, means supporting said cutter for carrying the cutter laterally relative to the direction of web travel across the entire width of the web,

spring means biased for urging said knife members together and closing said cutting edges in a scissors movement as said cutter enters the web edge,

and releasable holding means holding said knife members apart and releasing them at the web edge.

13. A mechanism for cutting a traveling web comprising,

a cutter including a first knife member and a second knife member for cutting the traveling web into two separate pieces, said first and second knife members each having cutting edges,

spring means biased for urging said knife members together and closing said cutting edges in a scissors movement as the cutter enters the web edge,

means supporting said cutter for carrying the cutter laterally relative to the direction of web travel across the entire width of the web,

a stationary cam located at the edge of the web,

a follower on the second knife member,

said first knife member being held stationary on said supporting means, means returning said supporting means to .a startpoint relative to movement across the web, said cam positioned to release the follower at the edge of the web,

and means for starting said supporting means across the web.

A mechanism for cutting a traveling web comprising,

a cutter including a first knife member and a second knife member each having cutting edges,

means supporting said cutter for carrying the cutter laterally relative to the direction of web travel,

means supporting said knife members to form a V therebetween,

and means moving said knife members together for cutting the edge of the web in a scissors action only after said supporting means has carried the cutter against the Web to gather the edge of the web against said V.

15. A cutting mechanism for acting on a traveling web having a surface moving with the web comprising,

a movable cart means having wheel means frictionally engageable with said surface positioned at an angle leading into the direction of web travel for carrying said cart means across the width of the web,

a slitting knife means carried on the cart means for forming an angular cut across the width of the web from a starting to a finishing location,

and means elevating said cart means above said surface and returning it to said starting location for forming a new cut.

16. A cutting mechanism for acting on a traveling web having a surface moving with the web comprising,

a movable cart means,

a slitting knife means carried on the cart means for forming an angular cut across the width of the web from a starting to a finishing location,

an overhead track extending above the cart means having a starting and a finishing end and extending along the path of travel of the cart means,

carrying means on the cart means coacting with said track for supporting the cart means when the track is elevated,

and means for elevating said track at the termination of a run of the cart means from starting to finishing location with finishing end being higher than said starting end so that cart means will move back to said starting location.

17. A cutting mechanism for acting on a traveling web having a surface moving with the web comprising,

a movablelcart means,.

a slitting knife means carried on the cart means for forming an angular cut across the width of the web from a starting to a finishing location,

an overhead track extending above the cart means having a starting and a finishing end and extending along the path of travel of the cart means,

carrying means on the cart means coacting with said track for supporting the cart means when the track is elevated,

pivotally mounted arbor arms at each end of the track,

connecting arms pivot-ally connected to the arbor arms and secured to the track ends,

the connecting arm at the finishing end of the track being longer than the connecting arm at the starting end so that when said arbor arms are raised upwardly the finishing end of the track is supported higher than the starting end and said cart means travels to said starting location.

18. The method of cutting off a traveling paper web comprising the steps, first forming an initial cut at one edge of the web with a positive cutting action during the motion of the web, and thereafter forcing a knife laterally across the entire width of the web starting from said initial cut during the continued motion of the web so that the web is cut into two separate pieces.

19. The method of cutting off a traveling paper web with a moving knife comprising, forcing a cutting edge against the knife with the edge of the web therebetween while moving the knife against the web to provide an initial cut duning the motion of the web, and thereafter continuing to move the knife across the entire width of the web as soon as the initial cut is formed during the continued motion of the web so that the web is cut into two separate pieces.

20. The method of cutting off a traveling paper web with a moving knife and a cutting edge comprising the steps, forcing the knife into the edge of the web with a cutting edge forming a V therewith, bringing said knife and edge together late only after the Web has been forced into the V and as gathered against the V, and continuing movement of the knife and cutting edge across the web with substantially no relative movement therebetween.

21. A web cutting mechanism for a winding machine comprising in combination,

a supporting drum for the winding machine supporting a web thereon,

a cart means for moving across the drum,

friction wheels adjustably mounted on the cart means for changing their angle relative to the cart means,

a platform positioned adjacent the drum for supporting the cart means,

a piston and cylinder operated arm for pushing said cart means onto said drum off of said platform,

a guide bar extending across said drum,

a curved follower of a low friction material on said cart means for riding against said guide bar,

a track mounted with said guide bar,

rollers on said cart means positioned in said track and freely movable therein with the cart on said drum,

an overhead support for said track and guide bar including a pair of pivotally supported end arbor arms and support arms connected pivotally thereto and connected to said track with the support arm at a starting end for the cart being longer thana support arm at the finishing end so that when said arbor arms are elevated the finishing end of the track will be higher than the starting end for free return of the cart means on said rollers,

power means for pivoting said arbor arms,

a cutter adjustably mounted on said cart means for varying the angle to be substantially parallel to said wheels,

said cutter including a lower first knife member,

a plow member for sliding along the surface of a drum and having spring means for urging the plow member against the drum with "said plow member being pivotally mounted on the cart means,

a second knife member above the first knife member and pivoted with respect thereto,

a spring urging said second knife member against said first knife member in a scissor action,

and a follower on said first knife member engageable with said cam when the cart means is on said platform and moving free of said cam as the edge of the web is gathered in the V formed between said knife members for forming an initial cut with the relative action of said knife members,

said knife members remaining in a V with movement of the cart across the drum for cutting the web,

22. A cutting mechanism for acting on a traveling web supported on a drum with a surface comprising,

a movable cart means,

a slitting knife means carried on the cart means for forming an angular cut across the width of the web,

wheel means on the cart means fricti-onally engagea'ble with said drum surface positioned at an angle leading into the direction of web travel for carrying said car-t means across the width of the web,

a guide bar extending along the drum,

a follower on the cart means engaging said guide bar as the cart means moves across the web,

a platform located beside the drum for supporting the cart,

and means for moving the cart means off of the platform onto said drum for the beginning of its movement across the drum.

23. A cutting mechanism for acting on a traveling web supported on a drum surface comprising,

a movable cart means,

a slitting knife means carried on the cart means for forming an angular cut across the width of the web,

wheel means frictionally engageable with said drum surface mounted on the cart means and positioned an an angle leading into the direction of web travel for transmitting a frictional force from said drum surface to said cart means so that said cart means is propelled across said surface,

a guide bar extending across the drum surface, and

a smooth low friction follower on said cart means engageable with said guide 'bar.

24. A cutting mechanism for cutting a traveling web supported on the surface of a rotating dlrum comprising,

a cart means,

wheel means frictionally engageable with said drum surface mounted on said cart means at an angle leading into the direction of web travel for frictionally engaging the drum surface,

a guide bar extending along said drum,

a follower on the cart means for engaging said guide bar,

a knife movably mounted on said cart means having a cutting edge for cutting the Web,

and means raising said Web above the drum surface ahead of said knife.

25. A' cutting mechanism for cutting a traveling Web supported on the surface of a rotating drum comprising,

a cart means,

wheel means frictionally engageable with said drum surface mounted on said cart means at an angle leading into the direction of web travel for transmitting a frictional force from said drum surface to said cart means so that said cart means is propelled across said drum surface,

a guide bar extending along said drum,

a follower on the cart means for engaging said guide bar,

a knife movable mounted on said cart means having a cutting edge for cutting the web,

12 and means tensioning said web for engagement by said knife for facilitating ease of cutting the web.

References Cited by the Examiner UNITED STATES PATENTS 637,620 11/1899 King 242-56 X 1,180,363 4/1916 Allatt 22594 X 1,500,632 7/1924 Marquette 83--353 X 1,967,486 7/1934 Vennewitz 83353 2,570,696 11/1951 Levine 83353 X 2,620,993 12/1952 Jeffery 836l4 2,801,458 8/1957 Remmen 83-491 X 2,969,930 1/1961 Zernov 83428 X 3,072,004 1/1963 Jenkins 83318 3,142,217 7/1964 Busse 83-614 X WILLIAM W. DYER, JR., Primary Examiner. 

1. A WEB CUTTING MECHANISM FOR A TRAVELING WEB COMPRISING, A WEB SUPPORTING ROTATING DRUM HAVING A CYLINDRICAL OUTER SURFACE, A FIRST BLADE HAVING AN UPWARDLY FACING CUTTING EDGE FOR MOVING ACROSS THE DRUM BENEATH THE WEB AND CUTTING THE WEB, A COACTING INITIAL CUT SECOND BLADE COACTING WITH SAID FIRST BLADE FOR FORMING AN INITIAL CUT, MEANS MOVING SAID SECOND BLADE DOWNWARDLY AGAINST SAID WEB COACTING WITH SAID FIRST BLADE IN A SCISSORS ACTION AT THE EDGE OF THE WEB FOR INITIATING SAID CUT, A CART MEANS SUPPORTING SAID BLADES, AND WHEEL MEANS ON SAID CART MEANS ANGLES WITH RESPECT TO THE AXIS OF SAID DRUM FOR CARRYING THE CART MEANS ALONG THE DRUM LENGTH FOR CUTTING THE WEB. 